Answer:
A helium nucleus
Thre types of radiation
Alpha: Helium nucleus
Beta: Electron
Gamma: Gamma rays
Oxidation and reduction reactions (redox) involve the loss and gain of electrons. Half-reactions are a way for us to keep track of how many electrons are gained or lost by a particular species during a chemical reaction. These half reactions can be useful in understanding how batteries work, and how other reactions that occur in your body and in nature work as well. Questions 1. In the model, are electrons lost or gained during oxidation
Answer:
Electrons are lost during oxidation (LEO)
Maria examines a mixture that appears to be the same throughout. However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid.
Which conclusion best fits her observations?
Answer:
However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid. Which conclusion best fits her observations? The mixture is a solution because it has the same appearance throughout the sample
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What is the pH of a solution with a concentration of 4.2 x 10−5 M H3O+? (4 points)
Select one:
a. 2.31
b. 4.38
c. 5.62
d. 6.87
What is the pH of a solution with a 4.60 x 10−4 M hydroxide ion concentration? (4 points)
Select one:
a. 0.663
b. 3.33
c. 10.1
d. 10.7
Answer:
1) b. 4.38
2) d. 10.7
Explanation:
1) The problem tells us that [H₃O⁺] = 4.2x10⁻⁵ M, and keeping in mind that [H₃O⁺]= [H⁺], we can calculate the pH of the solution:
pH = -log[H⁺] = 4.382) First we calculate the pOH of the solution:
pOH = -log[OH⁻] = -log(4.6x10⁻⁴) = 3.33Then we calculate the pH using the following formula:
pH = 14 - pOH = 14 - 3.33pH = 10.7The pH of a solution with a concentration of 4.2x10⁻⁵ M H₃O⁺ ion is 4.38 and of a solution with a concentration of 4.6x10⁻⁴ OH⁻ ion is 10.7.
What is pH and pOH?pH of any solution is define as the negative log of the concentration of H⁺ ions and pOH is define as the negative log of the concentration of OH⁻ ions.
Given that concentration of H⁺ ions in solution = 4.2x10⁻⁵ M
pH for this solution is calculated as:
pH = -log(4.2x10⁻⁵) = 4.38
Also given that concentration of OH⁻ ions in solution = 4.6x10⁻⁴
pOH = -log(4.6x10⁻⁴) = 3.33
We know that, pH + pOH = 14.
pH = 14 - 3.33 = 10.7
Hence, value of pH & pOH is 4.38 and 10.7 respectively.
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What would happen to the entropy in the reaction 203(9) ► 302(9)?
A. It is impossible to tell.
B. It stays the same.
C. It decreases.
D. It increases.
bez number of particles in reaction increases so randomness or entropy increase.
as entropy is the degree of randomness of particles in a system
PLEASE HELP THIS IS AN EMERGENCY!!!!!
An atom's electron configuration ends with 3p3. If another atom has nine more electrons, what would be the continuation of the electron configuration? (5 points)
A.)3p64s23d4
B.)03p34s23d7
C.)3p63d44s2
D.)3p33d74s2
Answer:
A.) is the correct answer
The continuation of the electronic configuration would be 3p6, 4s2, 3d4
The initial p-orbital (the 3p3) is incompletely filled. Thus, the first thing would be to fill it completely (3p6) so as to obey the orbital-filling rule. This leaves 6 more electrons
After 3p orbital, the next orbitals are 4s, 3d, 4p, 5s, etc.
The 4s orbital will take a maximum of 2 electrons, leaving 4 more electrons.
Next would be the 3d orbital which can take a maximum of 8 electrons, but only 4 electrons are left.
Thus, the electronic configuration would be 3p6, 4s2, 3d4.
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what would the answer be? if you could help that would be a big help ^^
Answer:
well a 1000
Explanation:
How does light demonstrate quantization?
A. The velocity of a light wave has a direction as well as speed.
B. The wavelength of light increases as the frequency decreases.
C. The frequency of light increases as energy increases.
D. The energy in light waves comes in units called photons.
Answer:
D. The energy in light waves comes in units called photons.
Explanation:
its known as quatum theory
©
What is the maximum number of electrons that can occupy a box in an orbital filling diagram at any
energy level?
2
6
8
14
Answer:
2
Explanation:
Which fundamental force(s) can act over very long distances?
A. Gravity and electrostatic force
B. Strong nuclear force and weak nuclear force
C. Gravity only
D. Electrostatic force and strong nuclear force
Answer:
C. Gravity only
Explanation:
How does the process of cell division replace damaged cells
Cells split into two new cells with the identical genetic make up
Chloroplasts use carbon dioxide and water to create glucose
Metatron Gia uses oxygen to break down glucose and convert it to ATP
Waste passes through the cell membrane and leaves the cell
Answer:
A
Explanation:
The cells split up into two to repair the damaged cell
Explain what will happen to the crystal when cations are pushed they face each other and the movement is simulating an applied force
Answer:
When an ionic crystal breaks, it tends to do so along smooth planes because ... ions are forced near each other and the repulsive force causes the crystal to shatter. ... Cations move to one electrode, while anions move to the other, ... Diagram of ions in an ionic solution when an electrical current is applied.
Explanation:
Hope this helped
What is the frequency of an electromagnetic wave that has a wavelength of
8.5 x 102 m in a vacuum? (The speed of light in a vacuum is 3.00 x 108 m/s.)
A. 1.2 x 10-3 Hz
B. 2.8 x 10-6 Hz
C. 3.5 105 Hz
D. 2.6 x 1011 Hz
➡ ANSWER
☑ C. 3.5 105 Hz
Un compuesto orgánico que contenía solo H y C fue quemado en corriente de O2, encontrándose que 0.210 g daban 0.660 g de CO2.La densidad del vapor del compuesto es de 1.87 g/dm3 a 273 °K y 1 atm. ¿Cuál es la fórmula molecular?
Answer:
[tex]C_3H_6[/tex]
Explanation:
¡Hola!
En este caso, basado en la información dada, es posible calcular las moles de carbono en el compuesto al usar la masa molar del CO2 y la siguiente relación molar:
[tex]n_C=0.660gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molC}{1molCO_2}=0.015molC[/tex]
Ahora, calculamos las moles de hidrógeno restando la masa de carbono de la de la muestra basado en el siguiente factor molar:
[tex]m_{H}=0.210g-0.015molC*12.01gC/molC=0.030molH[/tex]
Entonces la formula empírica del compuesto resulta:
[tex]CH_2[/tex]
Dado que el carbono y el hidrógeno están en una relación 1:2. Ahora bien, calculamos la masa molar del gas considerando la presión, densidad y temperatura del mismo:
[tex]PV=nRT\\\\PV=\frac{m}{MM}RT \\\\MM=\frac{m}{V}\frac{RT}{P}=\frac{dRT}{P}\\\\MM=\frac{1.87g/dm^3*0.08206\frac{atm*L}{mol*K}*273K}{1atm}=41.9g/mol[/tex]
Es decir que la fórmula molecular y la empírica están en una relación de 3, por lo que la fórmula molecular resulta:
[tex]C_3H_6[/tex]
¡Saludos!
Explain how you determine the molar mass of Al2(SO4)3
Molar Mass of Al = 27
Molar Mass of S = 32
Molar Mass of O = 16
Putting the molar mass value in Al2 (SO4) 3
27 x 2 + 3 ( 32 + 16 x 4)
54 + 3 ( 32+ 64)
54 + 3 x 96
54 + 288
342
A bird has flown 300 metres for 6 hours. What is the bird's speed? Formula for speed = d/t * 2 points
40 m/hr
50 m/s
50 m/h
50 m/min
Answer:
C
Explanation:
d=300
t=6hr
speed=?
speed=300/6
speed=50m/hr the important thing in this question is to get the right units
Help please and thank you
Answer:
5. The coefficients are: 2, 7, 2, 4
6. The coefficients are: 1, 4, 1, 2
Explanation:
5. Balancing the equation.
__NO₂ + __H₂ —> __NH₃ + __H₂O
The above equation can be balance as illustrated below:
NO₂ + H₂ —> NH₃ + H₂O
There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by writing 2 before NO₂ and 4 before H₂O as shown below:
2NO₂ + H₂ —> NH₃ + 4H₂O
There are 2 atoms of N on the left side and 1 atom on the right side. It can be balance by writing 2 before NH₃ as shown below:
2NO₂ + H₂ —> 2NH₃ + 4H₂O
There are 2 atoms of H on the left side and a total of 14 atoms on the right side. It can be balance by writing 7 before H₂ as shown below:
2NO₂ + 7H₂ —> 2NH₃ + 4H₂O
Now the equation is balanced. Thus, the coefficients are: 2, 7, 2, 4
6. Balancing the equation:
__SiO₂ + __HF —> __SiF₄ + __H₂O
The above equation can be balance as illustrated below:
SiO₂ + HF —> SiF₄ + H₂O
There are 4 atoms of F on the right side and 1 atom on the left side. It can be balance by writing 4 before HF as shown below:
SiO₂ + 4HF —> SiF₄ + H₂O
There are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 2 before H₂O as shown below:
SiO₂ + 4HF —> SiF₄ + 2H₂O
Now the equation is balanced. Thus, the coefficients are: 1, 4, 1, 2
What are the coefficients for the following equation when it is balanced?
CaF2 (aq)
KOH(aq) →
Ca(OH)2 (s)
KF (aq)
What is the mass of 0.125 moles of tin sulfate (SnSO4)?
Answer:
26.85 grams
Explanation:
The formula for mole calculations is number of moles = given mass/gram-formula mass.
The number of moles is given to us, which is 0.125.
The gram formula mass of SnSO4 is about 214.77.
Plug in the values we have into the equation. It should look like this:
0.125 = x / 214.77
Solve for x by multiplying 214.77 and 0.125. The answer should be about 26.85 grams.
If you increase the amount of Reactant A, the reaction rate will also increase.
What is this statement an example of?
A. A theory
B. An observation
C. A hypothesis
D. A scientific question
Select the atoms that are likely to gain electrons to form anions:
A. Cesium (Cs)
B. Chlorine (CI)
c. Nitrogen (N)
D. Sulfur (S)
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Answer:
c
Explanation:
What is the predicted change in the boiling point of water when 2.10 g of
barium chloride (BaCl2) is dissolved in 5.50 kg of water?
The addition of any non-volatile solutes will elevate the boiling point of the solution. The change in boiling point of water by the addition of 2.10 of barium chloride is 0.0028 ° C. Hence, option A is correct.
What is boiling point?Boiling point of a substance is the temperature at which it changes from liquid to vapour where the two states are in equilibrium. Boiling point of a substance depends on the bond type, molecular mass and purity of it.
The change or elevation of boiling point of a solution can be determined from its molality m and elevation constant Kb and the Van't Hoff factor i as follows:
ΔT = i Kb m.
Molality of the solution is the no.of moles divided by the mass of solvent in kilogram. Given the mass of barium chloride is 2.10 g and its molar mass is 208.23 g . The no.of moles of solute is 2.10/208.23 g = 0.0100.
Molality of the solution can be calculated as follows:
Molality m = 0.0100 / 5.50 Kg
= 0.0018 mol/kg.
Now, the ΔT s calculated from these values. Provided Kb of water is 0.51 ° C /mol and i = 3.
ΔT = 0.0018 mol/kg × 0.51 × 3
= 0.0028 ° C.
Therefore, water will boil at 100.0028 ° C. Hence, option A is correct.
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Please help please help
Answer:
sry I don't know much about chemistry
What is a reaction rate
Answer:
Explanation:
A reaction rate is the measure of the change in concentration of the disappearance of reactants or the change in concentration of the appearance of products per unit time
Substances with a high polarity have a(low/high) surface tension ?
Answer:
I think they have high, because the nonpolar molecules usually have a much lower surface tension than polar ones.
sulphur dioxide reacts with oxygen to produce sulphur trioxide, balance the chemical equation using lcm method?
Answer:
2SO2 + O2 → 2SO3
Explanation:
According to this question, sulphur dioxide (SO2) reacts with oxygen to produce sulphur trioxide (SO3). The equation is as follows:
SO2 + O2 → SO3
The above equation is unbalanced because there are unequal number of atoms of each element in the both reactants and products. To balance the equation, we use coefficients to make the number of atoms equal. The balanced equation is as follows:
2SO2 + O2 → 2SO3
- There are 2 moles of S on both sides of the equation.
- There are 4 moles of Oxygen on both sides of the equation.
Can you give me a paragraph about the digestive system?
Answer:
The digestive system is very important to animal health. Without the digestive system earth might still be lifeless other than bacteria and what not. The digestive system is a system to keep us full and energized. It allows us to chew and swallow our food and let it break down in our belly acid. Then it departs our body through the large, small intestines to then be flushed out to sea.
~ LadyBrain
Explanation:
an organ that is part of the
digestive system his digestive system is extremely simple
When copper is heated in air, the solid product that is formed has a greater mass than the original copper. When calcium carbonate is heated in air, the solid product that is formed has less mass than the original
calcium carbonate. Why is the mass of the solid product greater in one reaction but less in the other reaction?
Answer:
When heated, oxygen reacts with copper to form copper oxide. If this reaction occurs in a sealed container, will the mass of the container and everything in it increase, decrease, or stay the same and why? The mass will increase because a new kind of molecule is formed.
Explanation:
As above, carbonates decompose upon heating to give the metal oxide and carbon dioxide. The mass is lost as carbon dioxide.
To solve this we must be knowing each and every concept related to mass. Therefore, Carbon dioxide is released as the mass is depleted when carbonates are heated.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes.
When copper was heated in the air, the resulting solid product has a larger mass than the initial copper. When calcium carbonate was heated in air, the resulting solid product has much less mass than the initial calcium carbonate. When carbonates are heated, they breakdown into metal oxides and carbon dioxide. Carbon dioxide is released as the mass is depleted.
Therefore, Carbon dioxide is released as the mass is depleted.
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I need help with number 19 A through D
18- The number of orbitals in each sublevel are:
A:-s:2, p:3, d:10, and f:14
B:-s:2, p:6, d:10, and f:14
C:-s:1, p:3, d:5, and f:7
D:-s:1, p:2, d:3, and f: 4
s2,p6,d10,f14
S contains 2 orbitals
P contains 6 orbitals
D contains 10 orbitals
F contains 14 orbitals
A student made a sketch of a potential energy diagram to represent an endothermic reaction.
Explain, using complete sentences, why the diagram made by the student is correct or incorrect. Be sure to also explain what the values of X and Y represent. (10 points)
Answer:
Incorrect
Explanation:
X is the reactants
Y is the products
In an endothermic reaction where energy is absorbed, the enthalpy the products (Y) is always higher than the enthalpy of the reactants (X).
Enthalpy change (∆H) = products (Y) - Reactants (X)
For an endothermic reaction, the ∆H value should be positive.
Enthalpy change
The diagram sketched by the students shows the opposite. The diagram shows that the enthalpy of the products (Y) is lower than the enthalpy of the reactants (X). This will give a negative value of ∆H.
It represents an exothermic reaction rather than endothermic.
Therefore, the student is incorrect.